Die for manufacturing shoes for stamp-mills



(No Model) 2 Sheets-Sheet 1.

" T. OLEARY.

' DIE FOR MANUFACTURING SHOES FOR STAMPMILLS.

No. 550,026. v I Patented Nov. 19,-1895.

ANDRKW ELEM/AM.PMOTOUTMQWASHINGfbMnt.

(N0 Mode1.) 2 Sheets-Sheet 2.

T. OLEARY. DIE FOR MANUFACTURING SHOES FOR STAMP MILLS.

Patented Nov. 19, 1895.

UNITED STATES PATENT OFFIcE.

TIMOTHY OLEARY, OF SAN FRANCISCO, CALIFORNIA.

DIE FOR MANUFACTURINVCFSHOES FOR STAMP-MILLS.

SPECIFICATION forming part of Letters Patent No. 550,026, dated November19, 1895.

Application filed March 19, 1894.

To all whom it may concern:

Be it known that I, TIMOTHY OLEARY, a citizen of the United States,residing in the city and county of San Francisco and State ofCalifornia, have invented certain new and useful Improvements in theManufacture of IVrought Metal Shoes for Ore Stamp Mills and in Dies forProducing the Same, of which the following is a specification.

My invention relates to the production of a shoe for an ore stamp-millout of wroughtmetal as a new article of manufacture.

The invention has for its object the production of an article that ismuch superior in many respects to the present cast-metal shoe and themanufacture of the same at relatively small cost.

To such ends and object my invention con. sists, first, in awrought-metal shoe for ore stamp-mills forged and finished at a simpleoperation from bar metal, and, secondly, in certain improvements in theconstruction of forging-dies specially adapted to manufacture the saidshoe out of bar metal, as hereinafter more fully explained and setforth.

The following description explains the nature of my said invention andthe manner in which I proceed to carry out, practice, and apply thesame, reference being had to the drawings that accompany and form a partof this specification.

Figure 1 of the said drawings represents a pair of forging-diesconstructedvin accordance with my invention for the manufacture of mywrought-metal shoe. The figure represents the dies in verticallongitudinal section with a finished shoe resting in the dies, but stillattached by a stub to the bar from which it is forged. Fig. 2 is a planof the bottom die. Fig. 2 is a top view of a cutter which is inserted inthe die to separate the. finished piece from the stub at the end of theforging operation. Fig. 3 is a vertical crosssection of the lower dietaken at the line 00 y, Fig. 2. Fig. 4 is a cross-section taken at theline a: 2, Fig. 2. Fig. 5 is a perspective view of the two dies partlyseparated before the bar of metal is inserted. This figure shows theinsertible cutters that are set into the dies to separate the finishedpiece from the stub at the end of the forging operation, and

Serial to. 504,312. (Nb model) that is to say, with the cylindrical body1 and the tapered neck 2 of the shoe, excepting that the edges of thetwo cavities are chamfered and rounded off, so that the meeting-edges ofthe two faces around the cavity are set back toward the outer edges ofthe dies along each side. The cavity is cylindrical along the top andthe bottom, but from a point or line about two-thirds the distanceupward toward the horizontal diameter x x, Figs. 3 and 4, the cavity ineachdie increases in width toward the sides, so that along both sidesthe cylindrical body-cavity 1 and the neck-cavity 2 are spread outwardin shallow channels or spaces 3 In addition to these cavities andflaring channels there is formed in each die a stubcavity 4 extendingfrom'the head of the bodyeavity 1 outward to the front end of the blockand connected with the principal cavity by a neck or contracted part 5and from that part gradually increasing in diameter outward to the endof the block. The last-mentioned or stub cavity corresponds in shapewith the neck-cavity 23 at the back or opposite end of the die, but issomewhat shorter, and at the base or widest end it is somewhat larger indiameter than the widest end of the aforesaid neck-cavity 2 where itjoins the body-cavity 1 The chamfered or cut-away sides of the cavitiesare finished on smooth curved lines, as clearly shown in the sections,Figs. 3 and 4, and the corresponding surfaces in the top die arelikewise rounded and finished to the same extent, so that when the twodies are in working contact the spaces or channels 3 along the sides areequally disposed above and below the dividing-line between the two diesfor the length of the body-shaping cavity 1 and the length of theneck-shaping cavity 2 The two dies thus formed are placed under adrop-hammer, or they are fixed in place to the bed and the head,respectively,

of a power-hammer by dovetails formed on the back of the two dies in theusual way of fixing dies of this character.

In the operation of making the wroughtmetal shoe a square bar of metalof somewhat smaller dimensions in thickness than the diameter of thebody of the finished shoe is heated at the end and then introduced therequired distance between the dies. The hammer is then operated in theusual manner, and between the blows the bar is turned in the dies untilthe proper cylindrical shape is obtained. In and during the operationthe square bar is gradually brought to the shape of the body and theneck of the shoe by the partial rotation of the bar, which is first seton edge or with the square in diagonal. position between the two dies,and then the surplus metal forced outward into the side channels alongthe body and neck cavities is taken in and incorporated with the mainportions of metal to fill up and form the cylindrical bod y and thetaper-neck. The surplus metal is that portion in the rectangular barwhich is in excess of the quantity required for the neek-cavity 2 andalso that portion which unites the finished piece to the bar, and whichconsists of the stub portion lwhenthe forgin operation is completed andthe piece is ready to be separated from the die, and this additional.metal being first distributed into or taken up by the lateral channelsor recesses before described is afterward worked into the body and neckof the shoe. In this operation, also, the stud portion of the bar infront of the bottom or acting face of the shoe being forged is broughtinto shape for the neck of the next shoe, and at the end of one forging,when the finished piece is cut from the bar, this stub orpartially-shaped end of the bar is ready for inserting into the cavity 2of the dies for the next shoe.

In each block provision is made for inserting a cutting-tool (J acrossthe line of juncture between the end of the body-cavity 2 and the cavityi The cutter which I provide for this purpose is a bar 0 with a cuttingblade or edge 6* and a fiat back properly shaped to fit a groove orrecess 0 in the block at or in line with the narrow or contractedportion 5 of the cavity 48. These recesses C open to the outside at oneor both sides of the block, so that the cutter can readily be slipped.into place from the side of the die when the dies are separated and asreadily removed before the forging operation.

A wrought-metal shoe for ore-stamp batteries produced in the mannerabove described is superior in many respects to the cast-metal shoesheretofore used. It is not only much stronger, but will stand wear andbe serviceable for a much longer time. The metal of the body being closeand solid is always free from air-holes, so that a smooth solid face onthe bottom is obtained at all times during work as the shoe wears downinstead of being pitted or broken with holes and crevices, as in thecast-metal shoe.

Having thus fully described my invention, what I claim as new therein,and desire to secure by Letters Patent, is

1. An upper and a lower die each having a body-shaping cavity and aneckshaping cavity at one end of the first-mentioned cavity, bothsubstantially cylindrical along the bottom and flaring along the sidesforming when placed together a cavity to shape the body and a cavity toshape the neck of an ore stamp shoe, and channels or recesses along thesides thereof to take up and distribi'ite surplus metal of the bar, anda stub-shaping cavity at the opposite end of the body cavitysubstantially corresponding with. but larger than .aid neck cavity, asand for the purpose hereinbeforc set forth.

E2. The combination with an. upper and a lower forging die, each. havinga shaping cavity to produce the article to be forged, a supplementalstub cavity at the end of the principal or shaping cavity adapted topartially shape the bar or piece of metalv for the next article, and anarrow neck connecting these two cavities; of a removable cutterinsorted across said narrow neck, and for the purpose set forth.

An upper and a lower die, each. having near its center a body-shapingcavity, at one end thereof a neck-shaping cavity, the two adapted toform the body and neck respectively of an ore-sta1np-shoe, and at theother end of the central cavity a stub-shaping cavity extending out thefront end of the die for forming a stub on the metal being forged, thestub-cavity being somewhat short-er than the neck-cavity but slightlylarger at its outer end, whereby the metal of the stub is partiallyshaped to form the neck of the next succeed.- in g shoe, substantiallyas described.

4:. The combination with a pair of forging dies, of an insertiblecutting device adapted to separate the finished piece from the block orbar from which it is forged and removable from the said dies during theforging operation, substantially as hcreinbeforc set forth.

In testimony that I claim. the foregoing I have hereunto set my hand andseal.

TIMOTHY OLEARY. [L.

\Vitncsses EDWARD E. OSBORN, R. M. EDWARDS.

